Fig. 2 |. Development of the functionalized carbon-atom insertion reaction.

a, Identification of carbyne reagent. Reaction conditions: indene (0.1 mmol), 2 (0.12 mmol), Ru(dtbbpy)3(PF6)2 (1 mol%) and Na2CO3 (0.2 mmol) in CH3CN (0.05 M), irradiation with a 30 W blue LED (λmax = 450 nm) under an argon atmosphere at room temperature (r.t.) for 12 h. The yields were determined by GC-FID analysis using hexadecane as an internal standard. b, Control experiments. c, Sensitivity assessment of reaction conditions. GC-FID, gas chromatography-flame ionization detector; T, temperature; C, concentration; I, light intensity.